Comparisons between Multidimensional and Lumped-Parameter GOTHIC Containment Analyses with Data

Wolf, L.; Holzbauer, Helmut; Schall, M.

doi:10.13182/nt99-a2939

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…International organisms are taking into account these new tools, although not for DBA analysis, (OECD/ NEA, 2014a,b). The first use of these 3D models was motivated by hydrogen distribution analysis and then evolved to containment severe accident analysis thermal hydraulics, see (Wolf et al, 1999;Royl et al, 2000;Kim et al, 2004;Martín Valdepeñas et al, 2007) or (Jimenez et al, 2015). IAEA and the OECD/NEA state that CFD codes are able to reproduce more accurately the thermal hydraulic containment phe nomenology involving hydrogen (Abou Rjeily et al, 2011;OECD/NEA, 2014c).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the equipment and instrumentation qualification criteria using 3D containment models

Varas

Fernández-Cosials

Bocanegra

2017

Nuclear Engineering and Design

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Containment safety analyses of Design Basis Accidents (DBAs) rely on the use of Lumped Parameters (LP) codes, and therefore, on pressure and temperature averaged values In those analyses the full containment building is usually modeled with a single or few computational cells During the latest years, many efforts have been done to develop 3D containment models which bring the possibility of more detailed simulations Equipment and in-strumentation Environmental Qualification in containment are based on pressure and temperature enveloping profiles calculated with LP models These enveloping profiles calculated with LP models are the solution in a single cell that represents a large volume; however, 3D models volumes are subdivided in thousands of cells and could provide a more accurate solution In this paper, generic equipment and instrumentation Environmental Qualification (EQ) criteria are assessed during a Double Ended Guillotine Break Loss Of Coolant Accident in a PWR-W 3D containment model developed with GOTHIC 8 1 (QA)

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Section: Introductionmentioning

confidence: 99%

Analysis of the equipment and instrumentation qualification criteria using 3D containment models

Varas

Fernández-Cosials

Bocanegra

2017

Nuclear Engineering and Design

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“…Generally, there are two kinds of methods simulating the hydrogen distribution in an enclosure, including lumped‐parameter method and CFD codes. Date back to the period of the Three Mile Island accident, GOTHIC and CONTAIN codes were adopted to model the whole containment and then the average value of hydrogen concentration in each control volume were obtain. However, they could not predict the hydrogen concentration in local region, due to the restricted number of control volumes, and also they could not describe the turbulent diffusion behavior during the process of build‐up and erosion of stratification due to their lack of necessary turbulence models.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on erosion of hydrogen stratification by steam jet within a local compartment

2020

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Summary During hypothetical severe accidents in nuclear power plants, a large amount of hydrogen is generated rapidly as a result of zirconium‐water reaction and released into local compartments. Deflagration or detonation risk is probably caused by the uneven hydrogen distribution. Generally, buoyancy drives light combustible gas up to establish gas stratification. On the other hand, stratification may be destroyed by convection flow from steam injection due to coolant's discharge from the primary loop. The mechanism of erosion of stratification can be divided into buoyancy dominated and momentum dominated regimes, the priority of which depends on a nondimensional parameter, named of interaction Froude number. However, jet velocity and the diameter on the interface between steam and stratification are difficult to measure in experiments. Therefore, CFD method is adopted to capture a detailed velocity profile to solve this problem. In this article, a CFD model of single local compartment facility is built and helium distribution behavior within the local compartment is fully investigated, as a substitute of hydrogen, which is usually used in experiments. Prior to determining the interaction Froude number, four flow models, including laminar flow model, algebraic model, k‐ε turbulence model and shear stress transport (SST) k‐ω model are evaluated under three typical experimental stages, including light gas injection, the formation of stratification, and the erosion of stratification. Results show that SST k‐ω model can predict much better under these specific conditions in the small‐scaled configuration, compared to the experimental results. Next, with the setup of a helium stratification structure with homogeneous layer and gradient layer, the interaction between steam and gradient layer is analyzed in detail. The mechanisms of erosion of stratification can be divided into complete penetration, destruction from the bottom level to the top and soft dissolution without penetration, corresponding to the interaction Froude numbers of being greater than 1, close to 1, and far less than 1. The simulation results are consistent with relevant literature findings. The present work can help studying the complex hydrogen distribution process in local compartment and provide data for evaluation of postinerting strategy in severe accident management.

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“…International organisms are taking into account these new tools, although not for DBA analysis, [85], [84]. The first use of these 3D models was motivated by hydrogen distribution analysis and then evolved to containment severe accident analysis thermal hydraulics, see [179], [92], [180], [78] or [112]. IAEA and the OECD/NEA state that CFD codes are able to reproduce more accurately the thermal-hydraulic containment phenomenology involving hydrogen [181], [83] .…”

Section: Introductionmentioning

confidence: 99%

Analysis and improvement of hydrogen mitigation strategies during a severe accident in nuclear containments

Fernández-Cosials¹

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Comparisons between Multidimensional and Lumped-Parameter GOTHIC Containment Analyses with Data

Cited by 9 publications

References 2 publications

Analysis of the equipment and instrumentation qualification criteria using 3D containment models

Analysis of the equipment and instrumentation qualification criteria using 3D containment models

Numerical investigation on erosion of hydrogen stratification by steam jet within a local compartment

Analysis and improvement of hydrogen mitigation strategies during a severe accident in nuclear containments

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